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A method for efficiently retarding migration and degrading organic pollutants in leachate in situ

A technology of organic pollutants and leachate, applied in water pollutants, chemical instruments and methods, reduced water/sewage treatment, etc., can solve problems such as limited adsorption capacity, low anti-seepage coefficient, aging, etc., and achieve simple preparation and high effect Significantly, the effect of improving the blocking ability

Active Publication Date: 2018-04-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, because HDPE film is a petrochemical product, there is also a risk of aging after long-term use
GCL membrane is generally made of two layers of non-woven fabric sandwiching a layer of 5-10mm natural sodium bentonite, which can get a very low anti-seepage coefficient after being swollen with water, but its adsorption capacity is limited, and pollutants in leachate can easily pass through molecules Diffusion and other methods penetrate the liner and enter the groundwater (Foose, G.J., Benson, C.H., Edil, T.B., 2002. Comparison of solute transport in three compositeliners. J. Geotech. Geoenviron. 128, 391-403.)

Method used

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  • A method for efficiently retarding migration and degrading organic pollutants in leachate in situ
  • A method for efficiently retarding migration and degrading organic pollutants in leachate in situ
  • A method for efficiently retarding migration and degrading organic pollutants in leachate in situ

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Several bentonite materials with a water content of 30% and different amounts of CTMAB-bentonite were put into the ring cutter, and after being compacted with a hammer, the permeability coefficient of the material was measured by the method of variable water head permeability coefficient measurement.

[0041] Such as figure 1 As shown, the logarithmic value of the material permeability coefficient has a linear relationship with the content of organic bentonite, and the correlation coefficient r 2 is 0.9965. The total content of CTMAB-bentonite in the material is 10%, and the permeability coefficient is 1.13×10 -9 cm / s; the total content of CTMAB-bentonite in the material is 20%, and the permeability coefficient is 2.97×10 -9 cm / s, which are far lower than the national standard of 1×10 -7 cm / s.

Embodiment 2

[0043] A one-dimensional transport model including convection, advection and laminar flow was used to simulate the migration of phenanthrene in a 5cm liner containing different ratios of CTMAB-bentonite, and the initial concentration was set to 1mg / L.

[0044] Such as figure 2As shown, after 30 years, phenanthrene penetrated the liner containing 5% CTMAB-bentonite, and the peak concentration was 0.0116mg / L; its penetration time in the liner containing 10% CTMAB-bentonite was extended to 50 years, and the peak value The concentration is reduced to 0.0058mg / L; further, its penetration time in the liner containing 20% ​​CTMAB-bentonite is extended to 100 years, and the peak concentration is reduced to 0.0029mg / L; further, it is contained in 30% CTMAB -The penetration time in the bentonite liner is extended to 120 years, and the peak concentration is reduced to 0.0017mg / L; further, the penetration time in the liner containing 40% CTMAB-bentonite is extended to 160 years, and the ...

Embodiment 3

[0046] A one-dimensional transport model including convection, advection and laminar flow was used to simulate the migration of phenanthrene in liners containing 20% ​​CTMAB-bentonite with different thicknesses, and the initial concentration was set to 1mg / L.

[0047] Such as image 3 As shown, after 6 years, phenanthrene penetrated the 1cm thick pad, and the peak concentration was 0.0601mg / L; further, the time for penetrating the 2cm thick pad was extended to 20 years, and the peak concentration decreased to 0.0151mg / L ; Further, the time it penetrates 5cm thick this liner prolongs to be 100 years, and peak concentration reduces to 0.0029mg / L; Further, the time that it penetrates 10cm thick this liner prolongs to 500 years, and peak concentration reduces to 0.0008mg / L. Considering that the service life of the landfill can generally reach 60-80 years, the thickness of the liner should be greater than 5cm.

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Abstract

The invention discloses a method for efficiently retarding migration of organic pollutants in leachate and degrading the organic pollutants in an in-situ manner. The method includes adding, by weight, 2-20 parts of organic bentonite modified by cetyl trimethyl ammonium bromide and 1-10 parts of reduced iron powder into 100 parts of original soil of natural sodium bentonite, and uniformly mixing the organic bentonite, the reduced iron powder and the original soil with one another to obtain garbage landfill liner materials; flatly laying the garbage landfill liner materials with the thicknesses higher than 5 cm at the bottoms of landfills, filling the garbage landfill liner materials with garbage, allowing the leachate generated by the garbage to flow into the liner materials, adsorbing the pollutants by the aid of the garbage landfill liner materials and degrading the pollutants in the in-situ manner. The method has the advantages that obvious effects of retarding the organic pollutants in the leachate in the garbage landfills can be realized, the organic pollutants can be degraded in the in-situ manner, and the method can be widely applied to constructing the landfills.

Description

technical field [0001] The invention relates to a technology for self-cleaning and anti-seepage of garbage landfills, in particular to a method for efficiently retarding migration and in situ degrading organic pollutants in leachate. Background technique [0002] Human production and life produce a large amount of garbage that needs to be disposed of. At present, there are three main methods of waste disposal: landfill, incineration, and composting, among which landfill is still the most important disposal technology. A large amount of leachate will be generated during the landfill process of garbage, which is likely to cause secondary pollution. The composition of leachate is complex, and there are many kinds of pollutants. Among them, halogenated hydrocarbons such as tetrachloroethylene and chloroform are the pollutants with the highest toxicity index and are difficult to remove. In addition, compounds such as phenols, polycyclic aromatic hydrocarbons and phthalates are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F1/70B01J20/12B01J20/30C02F101/30C02F103/06
CPCB01J20/12B01J20/3085C02F1/281C02F1/288C02F1/705C02F2101/30C02F2103/06
Inventor 何士冲朱利中
Owner ZHEJIANG UNIV
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